Sharp EL-501WBBK Scientific Calculator, 10-Digit LCD "museums" Questions

battery replacement J-10A Good Morning Fhaas153 Looking at a J-10 picture on eBay http://www.ebay.com/itm/VINTAGE-CASIO-J-10-ELECTRONIC-CALCULATOR-8-DIGIT-TESTED-/331587643662 , the picture of the ...

dark screen The screen on my calculator is very faint, and it barely shows up. How do I fix this? If calculator uses batteries, change the batteries. If it uses solar polar, expose it to direct ...